Figure F10. Plot of biostratigraphic and paleomagnetic datum levels (see Tables T5 and T6) vs. mbsf. Individual symbols represent different types of stratigraphic datums: solid triangle = radiolarians, solid diamond = paleomagnetic reversal. Solid line segments = linear regressions of selected data points with the slope of these lines indicating sedimentation rates in m/m.y. as shown next to each segment. MARs are shown as values in mg/cm2/k.y.